Implemented horizontal and vertical mirroring for the uv editor.

game/addons/mesh_data_resource_editor/uv_editor/RectView.gd

@@ -63,19 +63,23 @@ func _enter_tree():
 		connect("visibility_changed", self, "on_visibility_changed")
 
 func on_mirror_horizontal_button_pressed() -> void:
-	pass
+	if selected_rect && is_instance_valid(selected_rect):
+		selected_rect.mirror_horizontal()
 	
 func on_mirror_vertical_button_pressed() -> void:
-	pass
+	if selected_rect && is_instance_valid(selected_rect):
+		selected_rect.mirror_vertical()
 	
 func on_rotate_left_button_button_pressed() -> void:
-	pass
+	if selected_rect && is_instance_valid(selected_rect):
+		selected_rect.rotate_uvs(rotation_amount)
 	
 func on_rotate_amount_spinbox_changed(val : float) -> void:
 	rotation_amount = val
 
 func on_rotate_right_button_button_pressed() -> void:
-	pass
+	if selected_rect && is_instance_valid(selected_rect):
+		selected_rect.rotate_uvs(-rotation_amount)
 
 func set_plugin(plugin : EditorPlugin) -> void:
 	_plugin = plugin

game/addons/mesh_data_resource_editor/uv_editor/RectViewNode.gd

@@ -52,6 +52,53 @@ func _draw():
 			draw_line(_uvs[_indices[i + 1]] * get_size(), _uvs[_indices[i + 2]] * get_size(), c, 1, false)
 			draw_line(_uvs[_indices[i + 2]] * get_size(), _uvs[_indices[i]] * get_size(), c, 1, false)
 
+func mirror_horizontal() -> void:
+	var pia : PoolIntArray = PoolIntArray()
+	for index in _indices:
+		var found : bool = false
+		
+		for i in pia:
+			if i == index:
+				found = true
+				break
+		
+		if found:
+			continue
+			
+		pia.append(index)
+		
+		var uv : Vector2 = _uvs[index]
+		uv.x = 1.0 - uv.x
+		_uvs.set(index, uv)
+		
+	apply_uv()
+	update()
+	
+func mirror_vertical() -> void:
+	var pia : PoolIntArray = PoolIntArray()
+	for index in _indices:
+		var found : bool = false
+		
+		for i in pia:
+			if i == index:
+				found = true
+				break
+		
+		if found:
+			continue
+			
+		pia.append(index)
+		
+		var uv : Vector2 = _uvs[index]
+		uv.y = 1.0 - uv.y
+		_uvs.set(index, uv)
+		
+	apply_uv()
+	update()
+	
+func rotate_uvs(amount : float) -> void:
+	pass
+
 func refresh() -> void:
 	if !_mdr:
 		return